<html>
  <head>
    <title></title>
    <style>
    
      html { }
      div.area {
        flow: "1 3"
              "2 4";
        border-spacing:6px;
      }
      picture
      {
        size:432dip 324dip;
        border:3px solid gray;
        foreground-image: url(images/photo1.jpg);
      }
      picture:hover 
      {
        foreground-image: url(images/photo2.jpg);
      }
      
      picture.blend
      {
        transition: blend linear 800ms;
      }
      
      picture.blend-atop
      {
        transition: blend-atop linear 800ms;
      }

    
    </style>
    <script type="text/tiscript"></script>
  </head>
<body>
  Hover the image:
  <div .area>
    <caption>transition: blend linear 800ms</caption>
    <picture .blend />
    <caption>transition: blend-atop linear 800ms</caption>
    <picture .blend-atop />
  </div>
</body>
</html>